package com.Interceptor.base;

import java.io.IOException;  
import java.util.ArrayList;  
import java.util.Arrays;  
import javax.servlet.Filter;  
import javax.servlet.FilterChain;  
import javax.servlet.FilterConfig;  
import javax.servlet.RequestDispatcher;  
import javax.servlet.ServletException;  
import javax.servlet.ServletRequest;  
import javax.servlet.ServletResponse;  
import javax.servlet.http.HttpServletRequest;  
  
public class ReDispatcherFilter implements Filter {  
    private ArrayList<String> includes = new ArrayList<String>();  
  
    @Override  
    public void destroy() {  
  
    }  
  
    @Override  
    public void doFilter(ServletRequest req, ServletResponse resp,  
            FilterChain chain) throws IOException, ServletException {  
        HttpServletRequest request = (HttpServletRequest) req;  
        String target = request.getRequestURI();  
        target = target.lastIndexOf("?") > 0 ? target.substring(  
                target.lastIndexOf("/") + 1,  
                target.lastIndexOf("?") - target.lastIndexOf("/")) : target  
                .substring(target.lastIndexOf("/") + 1);  
        if (this.includes.contains(target)) {  
            RequestDispatcher rdsp = request.getRequestDispatcher(target);  
            rdsp.forward(req,resp);  
        } else  
            chain.doFilter(req, resp);  
    }  
  
    @Override  
    public void init(FilterConfig config) throws ServletException {  
        this.includes.addAll(Arrays.asList(config.getInitParameter(  
                "includeServlets").split(",")));  
    }  
  
}  
